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Leya [2.2K]
3 years ago
14

Which would be considered a substance? Element, Compound, Mixture.

Chemistry
1 answer:
Romashka [77]3 years ago
3 0

Answer:

MIXTURE , ELEMENT AND SUBSTANCE

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What are the units for:<br> wavelength<br> frequency<br> energy
Oliga [24]

Answer:

wavelength.. meter

frequency.... Hertz (cycle per second)

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5 0
4 years ago
A 0.479 g sample of nitrogen, oxygen or neon gas occupies a volume of 265 ml at 157 kpa and 20◦c. what is the molar mass and ide
Anna11 [10]
PV = nRT
P = 157 kPa = 157 × 10³ Pa
V = 265 ml = 0.265 l
T = 20°C = 293 K
m = 0.479 g
PV•M = mRT
M = (mRT)/(PV)
M = 0.479 g × 8.314 kPa.l/(mol.K) × 293 K / (157 kPa × 0.265 l)
M ≈ 28.04579 g/mol.
Hence, the Molar Mass of Dinitrogen or Nitrogen Gas is 28 g.
7 0
3 years ago
How many moles of gas occupy 98 l at a pressure of 2.8 atmospheres and a temperature of 292 k?
Furkat [3]
From the ideal gas equation, we know that PV = nRT
where, P = pressure, V = volume occupied, n = number of moles of gas, R = universal gas constant=0.082L atm mol-1 K-1 and T = temperature.
Given: P = 2.8 atm, V = 98 l and T = 292 k.
Therefore n =\frac{PV}{RT} = \frac{2.8 X 98}{0.082 X 292} = 11.46
6 0
3 years ago
Which of the following is a statement of Hess's law?
attashe74 [19]

Answer:

C

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the enthalpy of reaction is independent of the reaction path

7 0
3 years ago
What happens to atoms after a chemical change?
forsale [732]

Answer:

They are not destroyed

Explanation:

Atoms are not destroyed or created they just rearrange and form new bonds!

4 0
3 years ago
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